CIDR Notation Calculator
Calculate network details from an IP address and CIDR prefix.
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Enter a CIDR address to see details.
Working with CIDR
This calculator is a quick way to translate an IP address with CIDR notation into its full network details. By providing the address and prefix length, you can instantly see the corresponding subnet mask, network address, valid host range, and total number of available hosts.
Frequently Asked Questions
What is CIDR?
Classless Inter-Domain Routing (CIDR) is a method for allocating IP addresses and IP routing. The CIDR notation (e.g., /24) represents the number of leading bits in the network portion of the address, which defines the size of the subnet.
How does CIDR relate to a subnet mask?
The CIDR prefix directly corresponds to a subnet mask. For example, a /24 prefix means the first 24 bits are 1s, which translates to a subnet mask of 255.255.255.0.